WO2008000465A1 - Circuit de commande et procédé de commande de diodes électroluminescentes - Google Patents

Circuit de commande et procédé de commande de diodes électroluminescentes Download PDF

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Publication number
WO2008000465A1
WO2008000465A1 PCT/EP2007/005694 EP2007005694W WO2008000465A1 WO 2008000465 A1 WO2008000465 A1 WO 2008000465A1 EP 2007005694 W EP2007005694 W EP 2007005694W WO 2008000465 A1 WO2008000465 A1 WO 2008000465A1
Authority
WO
WIPO (PCT)
Prior art keywords
signal
control circuit
light emitting
noise
emitting diodes
Prior art date
Application number
PCT/EP2007/005694
Other languages
English (en)
Inventor
Manfred Pauritsch
Original Assignee
Austriamicrosystems Ag
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Austriamicrosystems Ag filed Critical Austriamicrosystems Ag
Priority to DE112007001559.4T priority Critical patent/DE112007001559B4/de
Priority to JP2009516986A priority patent/JP5328646B2/ja
Publication of WO2008000465A1 publication Critical patent/WO2008000465A1/fr
Priority to GB0822114A priority patent/GB2452439A/en

Links

Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/10—Controlling the intensity of the light
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/40—Details of LED load circuits
    • H05B45/44—Details of LED load circuits with an active control inside an LED matrix
    • H05B45/46—Details of LED load circuits with an active control inside an LED matrix having LEDs disposed in parallel lines
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/08—Details of timing specific for flat panels, other than clock recovery
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • G09G2320/064—Adjustment of display parameters for control of overall brightness by time modulation of the brightness of the illumination source
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/06—Handling electromagnetic interferences [EMI], covering emitted as well as received electromagnetic radiation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Definitions

  • LEDs usually have a relatively high light output with a high efficiency and small dimensions. LEDs can emit light with a light spectrum corresponding to a visible range or to an infrared range or to other non-visible frequency ranges .
  • LEDs can be used in backlight systems of displays of television or monitor systems. With LEDs it is possible to achieve a more evenly distributed lighting system than with a conventional neon light for example.
  • Controlling of the brightness of a LED can be done by varying the value of a current through the LED. This can lead to a variation of the spectral color of the LED.
  • Another way of controlling LEDs is the use of pulse width modulated, PWM signals. In this case a mean current through the LED primarily has the same value.
  • FIG. 6 shows an embodiment of a conventional control circuit for controlling several strings STRl, STR2 , STR5 of LEDs.
  • Each string comprises a LED driving circuit VSl, VS2 , VS5, for example a voltage source, and a switch Sl, S2, S5.
  • the brightness of the LED is controlled by switching on or off the strings STRl, STR2 , STR5 depending on a pulse width modulated switching signal generated by a LED string switching control CCPWM.
  • a current flow for the LED strings STRl, STR2 , STR5 is completely switched on or off. This leads to high current peaks or spurs which cause electromagnetic interference, EMI.
  • the switching signal in a backlight system is usually synchronized with signals derived from a video signal, for example horizontal or vertical synchronization signals as HSYNC or VSYNC.
  • a video signal for example horizontal or vertical synchronization signals as HSYNC or VSYNC.
  • This can lead to optical interference between the switching signal and the synchronization signals.
  • the back lighted screen becomes dark on the same position or at the same time respectively when generating the video image from the video signal.
  • the lower half of the screen can be always darker than the upper half because of the synchronization.
  • a control circuit for controlling light emitting diodes comprises a switch for turning on or off a string of light emitting diodes.
  • a sigma delta modulator comprises a signal input for receiving a control signal, a signal output coupled to a control input of the switch and a clock input for receiving a clock signal with a clock period.
  • a combiner generates a control signal based on a data signal and on a noise signal.
  • the data signal can correspond to a desired brightness of the LEDs.
  • the inventive principle can easily be adapted to a greater number of controlled strings.
  • Figure 1 shows a first embodiment of a control circuit
  • Figure 2 shows a second embodiment of a control circuit
  • Figure 3 shows a third embodiment of a control circuit
  • Figure 4 shows a fourth embodiment of a control circuit
  • Figure 5 shows an exemplary time current diagram
  • Figure 6 shows an embodiment of a conventional control circuit .
  • FIG. 1 shows an exemplary embodiment of a control circuit for controlling LEDs.
  • a first string STRl of LEDs comprises several LEDs DlI, D12, D13, D14.
  • the number of LEDs is not limited to the four LEDs shown.
  • the LEDs DlI, D12, D13, D14 are connected in series between a LED driving circuit VSl and a switch Sl for turning on or off the first string STRl.
  • the control circuit comprises a first sigma delta modulator SDl which is formed by an adder Al and a delay element ZlI.
  • a first combiner CMBl receives a data signal DATA and a first noise signal generated by a first noise generator DNGl. The output of the first combiner CMBl is connected to an input of the first adder Al which forms the signal input SIl of the first sigma delta modulator SDl .
  • a carry output of the first adder Al forms a signal output SOl of the sigma delta modulator SDl and is connected to a control input of the switch Sl .
  • the data signal DATA can be a binary data word corresponding to a desired brightness of the LEDs.
  • the noise generator DNGl can be a digital noise generator, for example with fed back shift registers and XOR outputs.
  • the digital noise generator can generate a digital noise signal with an arbitrary word length.
  • the word length of the noise signal determines the randomness of the switching signal.
  • the word length of the data signal usually is greater than the word length of the noise signal.
  • the switch Sl is controlled by the switching signal which is modulated according to the sigma delta principle.
  • a bit stream is generated from or based on the desired brightness, where a time averaged mean value of the bit stream corresponds to a value of the control signal.
  • the clock frequency of the clock signal CLK is usually relatively high compared to a change frequency of the data signal DATA.
  • the digital noise generator DNGl Because the digital noise generator DNGl generates a pseudo- random sequence with positive and negative numbers with a mean value of zero, the mean value of the data signal DATA is not changed in average over time. Therefore the control signal provided on the signal input SIl of the sigma delta modulator SDl still corresponds to the data signal DATA, that means the desired brightness in average over time. Therefore the switching time or instance of switching is slightly varied, which reduces the effect of EMI.
  • Figure 2 shows another embodiment of a control circuit.
  • a second string STR2 of LEDs is controlled by the control circuit.
  • the string STR2 comprises a LED driving circuit VS2 and a second switch S2 for turning on or off the second string STR2.
  • control circuit comprises a delay element Z12 which on the input side is coupled to the signal output SOl of the first sigma delta modulator SDl.
  • An output of the delay element Z12 is coupled to a control input of the second switch S2.
  • the delay element Z12 comprises a clock input for providing the clock signal CLK.
  • the second switching signal at the output of the delay element Z12 is a delayed version of the first switching signal with a delay time corresponding to or being equal to a clock period of the clock signal CLK.
  • a time averaged mean of the current through the second string STR2 is not influenced by the delay, but as the first string STRl and the second string STR2 are switched on or off at different times, the total current at a time is reduced.
  • the total current of the arrangement hereby is the sum of a current through the first string STRl and the current through the second string STR2. Therefore the height of current steps of the total current is further reduced. This also leads to a reduction of EMI.
  • Figure 3 shows a further embodiment of a control circuit.
  • a string STR3 of LEDs comprising a LED driving circuit VS3 , LEDs D31, D32, D33, D34 and a switch S3, and a string STR5 with a LED driving circuit VS5, diodes D51, D52 , D53, D54 and a switch S5.
  • the control circuit comprises a second sigma delta modulator SD2 with an adder A2 and a delay element Z21, a second combiner CMB2 and a second digital noise generator DNG2.
  • a function of the second sigma delta modulator SD2 corresponds to the function of the first sigma delta modulator SDl.
  • the data signal DATA is provided to the second combiner CMB2 along with a second noise signal generated by the second digital noise generator DNG2.
  • the pseudo-random noise sequence of the second noise signal usually is different from the respective sequence of the first noise signal. Therefore the second control signal generated by the second combiner CMB2 and provided to the sigma delta modulator SD2 slightly differs from the first control signal.
  • the second sigma delta modulator SD2 generates a second switching signal for controlling the second switch S2 based on the second control signal. As the first and the second control signals differ, this leads to differing first and second switching signals and differing points in time for switching the strings STRl and STR3.
  • any number of further sigma delta modulators with respective combiners and digital noise generators can be provided, shown as an example with sigma delta modulator SD3 , combiner CMB3 and digital noise generator DNG3 which control the LED string STR5.
  • All combiners are provided with the same data signal DATA. Because every combiner CMBl, CMB2 , CMB3 is coupled to an independent digital noise generator DNGl, DNG2 , DNG3 , the control signals generated by the combiners differ from each other. This results in differing switching signals accordingly.
  • the average value of the LED current in each of the strings STRl, STR3 , STR5 in general is determined by the data signal DATA only. A total current of all strings at a time is reduced because the strings are not switched synchronously. Accordingly, the synchronous switching of LED strings can be circumvented although the respective average current in each LED string is unchanged.
  • Figure 4 shows another embodiment of a control circuit controlling several LED strings STRl, STR2 , STR3 , STR4, STR5.
  • the LED string STR4 comprises a LED driving circuit VS4, LEDs D41, D42, D43, D44 and a switch S4 for turning on or off the string STR4.
  • the number of LEDs in each of the strings is not limited to the shown number of four LEDs. It can be equal for all of the strings, for example when used in a backlight system for a rectangular screen. The number of LEDs could also be different and depends on the respective lighting application.
  • the LEDs or strings of LEDs respectively can be distributed equally over a screen area.
  • Controlling of the LED strings STRl and STR2 corresponds to the embodiment shown in figure 2.
  • the first switching signal for controlling the switch Sl is generated by the first sigma delta modulator SDl and the second switch is controlled by the second switching signal which is a delayed version of the first switching signal.
  • LED strings STR3 and STR4 are controlled in a similar manner as LED strings STRl and STR2.
  • a third switching signal is generated by the sigma delta modulator SD2 depending on the data signal DATA and the second noise signal generated by the digital noise generator DNG2.
  • a fourth switching signal for controlling the fourth LED string STR4 is generated by delaying the third switching signal for one clock period of the clock signal CLK by means of the delay element Z22.
  • a further string STR5 is controlled by a further switching signal generated by the sigma delta modulator SD3 , as described for figure 3.
  • the combiners CMBl, CMB2 , CMB3 and the adders Al, A2 , A3 of the respective sigma delta modulators can be implemented as accumulators with a respective word length corresponding to a word length of the data signal DATA and a noise signal.
  • the accumulators can be formed in hardware using for example simple logical circuits or can be realized in a digital signal processor, DSP.
  • the sigma delta modulation can be performed using digital signal processing.
  • Figure 5 shows a current time diagram comparing a total current of a control circuit and a conventional control circuit. In the lower half of figure 5 a total current IPWM of a control circuit using a pulse width modulated switching signal is shown.
  • the pulse ratio is about 60% according to a desired value for a brightness of 0.6. All LEDs or strings of LEDs respectively are switched at the same time. This results in a large current peak when switching the LEDs on or off respectively. The current peaks cause high electromagnetic interference with high spurs in the electromagnetic frequency spectrum.
  • the upper half of figure 5 shows a total current ISD for LED strings controlled with a control circuit according to one of the embodiments described.
  • the desired brightness value corresponds to the respective brightness value of the current IPWM, i.e. about 60%. It can be seen that switching off LED strings is performed more often using one of the embodiments described which leads to a distribution of the signal energy of the total current ISD over a broader frequency range. Because the current peak ⁇ ISD is smaller than the current peak ⁇ IDWM, peak values of the frequency spectrum of the total current ISD are smaller. Accordingly, the electromagnetic interference is reduced.
  • the embodiments described can be used in television or monitor backlight systems.
  • the strings of LEDs can comprise white LEDs which emit light in the full visible frequency range which is seen as white light by a human eye. Color information could be added by local filtering of the respective spectral components .
  • the strings of LEDs could comprise colored LEDs, for example red, green, blue LEDs, also known as RGB- LEDs.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Led Devices (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Optical Communication System (AREA)

Abstract

Circuit de commande destiné à commander des diodes électroluminescentes et équipé d'un commutateur destiné à allumer ou à éteindre une chaîne de diodes électroluminescentes. Un combinateur génère un signal de commande à partir d'un signal de données et d'un signal de bruit. Un modulateur sigma delta reçoit le signal de commande et un signal d'horloge avec une période d'horloge et génère un signal de commutation pour commander le commutateur.
PCT/EP2007/005694 2006-06-28 2007-06-27 Circuit de commande et procédé de commande de diodes électroluminescentes WO2008000465A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE112007001559.4T DE112007001559B4 (de) 2006-06-28 2007-06-27 Steuerungs-Schaltkreis und Verfahren zur Steuerung von lichtemittierenden Dioden
JP2009516986A JP5328646B2 (ja) 2006-06-28 2007-06-27 発光ダイオードを制御する制御回路及び制御方法
GB0822114A GB2452439A (en) 2006-06-28 2008-12-04 Control circuit and method for controlling light emitting diodes

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US11/477,146 2006-06-28
US11/477,146 US7768216B2 (en) 2006-06-28 2006-06-28 Control circuit and method for controlling light emitting diodes

Publications (1)

Publication Number Publication Date
WO2008000465A1 true WO2008000465A1 (fr) 2008-01-03

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PCT/EP2007/005694 WO2008000465A1 (fr) 2006-06-28 2007-06-27 Circuit de commande et procédé de commande de diodes électroluminescentes

Country Status (6)

Country Link
US (1) US7768216B2 (fr)
JP (1) JP5328646B2 (fr)
KR (1) KR101018522B1 (fr)
DE (1) DE112007001559B4 (fr)
GB (1) GB2452439A (fr)
WO (1) WO2008000465A1 (fr)

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JP2009542020A (ja) 2009-11-26
DE112007001559B4 (de) 2022-08-18
JP5328646B2 (ja) 2013-10-30
GB2452439A (en) 2009-03-04
KR101018522B1 (ko) 2011-03-03
US7768216B2 (en) 2010-08-03
KR20090034911A (ko) 2009-04-08
DE112007001559T5 (de) 2009-06-18
GB0822114D0 (en) 2009-01-07

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